Support for floor screeds



Nov. 12, 1940. E. c. GILSON SUPPORT FOR FLOOR SCREEDS FiledjJan. 5, 1938 "and around the? reinforcing members such' as* Somemeans has been found necessary to indicate the desired depth otthe' Patented Nov. 12, 1940 i te xin to Kyi AppIicaItionJanuaIy-B,1938,SerialNo.183;54l

The following specification relates v vention'in supports for screeds used in the laying of concrete floors or the like." l

. In laying concrete floors it is the usual prac.-'

tice to pour the'concrete overapprbpri'ateforms J'oists and the like.

1 concrete or the thickness of -th e slab generally measured from the the like. of posts set upon the form or joist and carrying at their tops a series of screeds. In this manner the position of the screed is predetermined position of the steel joist or and will thus permit leveling the top surface of the concrete as poured and at the desired height. Such construction offers the problem of satisfactorily gauging the height of the screed and at i the same time providing for ready and convenient removalof its support after the concrete has begun to harden.

My invention provides a simple device by which the screed will be supported at any adjustable height and held in fixed position during the casting operation.

Another object of my invention is to provide means for attaching the support to the joist withoutrisk of dislodgment or accidental change in adjustment. Afurther object ;of my invention is to provide means by which the support may be easily withdrawn from the concrete slab from beneath and leaving only a very small hole to be filled if not already filled by thesettling concrete. The device constituting my invention is simple in construction, cheap to manufacture,

extremely durable, and may be installed and'used without requiring skill on the part of the workmen. a As showing the preferred form in which my invention may be embodied I have illustrated it in the accompanying drawing in which Fig. 1 is a perspective view of the improved supportas used on a floor joist;

Fig. 2 is a frontelevation of the device, and

Fig. 3' is a vertical section taken on the line 3-3 of Fig. 1-.

The support is adapted to be applied to the customary metal floor joist 4 shown in the drawing, to have an upper chord 5 and a lower chord 6. Suitable truss bars 1 connect these chords.

A metal lath for casting concrete is indicated generally by the numeral 8.

The usual practice in casting the floor slab on .A-member "I0 platej-i'sprowded of iron, other metal, wood, composition or anysuitable like material. The m'ember lfl has atone end Ilia stirrupflornotch- This guiding means may take the form against accidental threaded and Y carries a nut to an in-k pae -siaidas; co r e i tended 156 be. held above the joist} Q at a predetermined height and is used leveling off the. top surface of the concrete as poured.

- My inv ntion relates primar ly to the support for-the screed '"g anomalie the following form. shown to be 'injthe .formoi a flat I 2 of suitable proportions to hold the screed 9 desirable that the screed extend. beyond the pro jecting. end ll.

At the lower end [3 of the member there is a at M which extends longitudinally of the mem her [0 for a considerable distance. This prodisplacement. .It is of course around the lower chord G'of the joist while the main portion of. the bar chord as shownin Fig. 3. l

The opposite end I 'l of the bar I5 is screw- I 8. Whilethis nut may be of the usual hexagonal or square form, I have shown it to be formed with an integral lever l9 by which the nut may be adjusted along the screw-threaded end l1.

The assembly and use of the device will be readily apparent. ,Where it is desired to apply this support to the joist 4 and lath 8, the latter is provided with an upper part of the I 5 passes above the after it has been applied.

held against the side edges of the chords 5 and care being taken that the supporting member extends upwardly to the desired height. The

I5 is inserted through the slot l4 against the joist and bring the supporting member 10 in close engagement with the opposite side of the joist.

The concrete will be poured --to a height indicated by the. screed 9 and before the concrete opening through which the I supporting member In will 'project or the form may be built around the member 10 In either event the. supporting member ID is has begun to set the clamp I5 is loosened from the supporting member In. The member ID may then be jarred loose from the concrete slab and drawn through the latter. In the event that this requires the application of considerable force, it may be supplied by a lever or grapple engaging the lower end 3.

The opening left by the removal of the upper end of the member ID if not already closed by the settling concrete, may then readily be filled with concrete and the supporting device is ready for further use.

While I have shown and described the preferred form of my invention, numerous changes in pro.- portions and minor details are ofcourseto' be considered as within the scope of the invention.

as defined in the following claims.

What I claim is: 1. A support for a floor screed comprising a clamp for attachment to a floor joist belowits upper edge and ,a member for supporting a screed from beneath, said member beingslotted longitudinally for adjustable connection with the clamp upwardly across and beyond thejoist.

2. A support for a floor .screedzcomprisinga clamp. for attachment to a. floor joist belowits upper. edge and afiat member having a notch at one end for supporting a screed and: a slot extending longitudinally of the member for receiving the clamp and adjusting the member vertically with respect to said joist.

3. A support for a floor screed comprising a clamp for attachment to a floor joist below its upper edge, said clamp having a screw threaded end, a flat member for supporting a screed from beneath, said member being longitudinally slotted to receive the said end of the clamp and to hold the member in vertically adjusted position relatively. to. said joist, and means on said clamp end to maintainclamping engagement between the member and clamp.

4. A support for a concrete floor screed, comprising a screed-supporting member extending upwardly from. beneath the lower surface of the concrete fioorwto be cast, said member having a lower slotted end, a clamp engaging a portion of a floor joist beneath the lower surface of the fioor,.andmeans on an end of the clamp to slidably receive the slotted end of the first named member.

5. In combination with a metal floor joist having upper and lower chords, a support for a screed comprising a screed-supporting member having a longitudinal slot, a clamp having one end for engagement with the lower'chord'of the joist, and means on its opposite end for drawing the'screedsupporting member against the side edges of both chords of the joist.

ED'WINYC. GILSON. 

